[ExI] underwater sprinkler, was: RE: Musical instruments in space

[Dave Sill]

On Fri, Mar 8, 2013 at 9:26 AM, spike <spike at rainier66.com> wrote:

> An example of the kinds of stuff we used to do is from a Feynman question.
>  You have seen those S-shaped lawn sprinklers, turn on the water, they
> spin.  What would happen if you took one of those, submerged it in water,
> connected the hose to a pump and pulled water thru it backwards?  Would it
> turn the opposite direction, since the tips of the arms would act as
> nozzles in reverse?  Or would it turn the same direction as before, since
> the water is creating centrifugal force as it goes around the bend?  Or
> would the forces exactly cancel and not turn?  Or a fourth possibility that
> blows your mind?
>
> I know the answer from experiment.  Can you figure it out from math and
> thought experiment?
>

So what's the answer?

-Dave
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